Automapper将DTO展平给带有孩子集合的父级 [英] Automapper flattened DTO to Parent with Child Collection

问题描述

我有一个扁平化的DTO，需要将其映射到有孩子的父母"关系.我想通过AutoMapper进行此操作，因为我正在其他地方使用它，并且效果很好.我已经看到了映射父级和子级的示例，但当子级"是一个集合并且源是扁平化的DTO时，则没有.我创建了一些类，可用于正确配置.下面是我的示例类:

I have a flattened DTO which I need to map to a Parent with Children relationship. I'd like to do this via AutoMapper as I'm using it in other places and it works great. I've seen examples of mapping a Parent and Child but not when the Child is a collection and the source is a flattened DTO. I've created some classes that I can use for getting the configuration correct. Below are my sample classes:

public class Parent
{
    public int ParentId { get; set; }
    public string ParentName { get; set; }

    public List<Child> Children { get; set; }
}
public class Child
{
    public int ChildId { get; set; }
    public string ChildName { get; set; }
}
public class ParentChildDTO
{
    public int ParentId { get; set; }
    public string ParentName { get; set; }
    public int ChildId { get; set; }
    public string ChildName { get; set; }
}

我正在启动时执行映射器初始化.在尝试执行映射之前，我不会收到任何错误.下面是我的映射器初始化代码.我一直留在注释行中，以显示我尝试完成此操作的另一种方式:

I'm performing the mapper initialization on startup. I'm not getting any errors until I try to perform the mapping. Below is my mapper initialization code. I've kept in the commented out line to show the other way that I've tried to accomplish this:

AutoMapper.Mapper.Initialize(cfg =>
            {
                cfg.CreateMap<ParentChildDTO, Child>();
                cfg.CreateMap<ParentChildDTO, Parent>()
                    .ForMember(dest => dest.Children, opt => opt.MapFrom(src => src));
                    //.ForMember(dest => dest.Children, opt => opt.MapFrom(src => new Child { ChildId = src.ChildId, ChildName = src.ChildName }));               

            });

以下是我用于尝试执行映射配置的代码:

Below is my code that I'm using for trying to perform the mapping configuration:

ParentChildDTO parentChildDTO = new ParentChildDTO { ParentId = 1, ParentName = "Parent Name", ChildId = 2, ChildName = "Child Name" };
Parent parent = AutoMapper.Mapper.Map<ParentChildDTO, Parent>(parentChildDTO);

List<LienActivity> mapTest = AutoMapper.Mapper.Map<List<BaseActivityUploadDTO>, List<LienActivity>>(request.Activities);

我曾考虑使用自定义值解析器，但希望通过正确的配置可以避免复杂性和额外的代码.

I've considered using a Custom Value Resolver, but was hoping to avoid the complexity and extra code if what I'm doing is possible with the correct configuration.

这是上面代码的错误:

错误映射类型.

Error mapping types.

映射类型:ParentChildDTO->父

Mapping types: ParentChildDTO -> Parent

类型映射配置:ParentChildDTO->父

Type Map configuration: ParentChildDTO -> Parent

财产:儿童

推荐答案

这里是您仅为Children属性定义自定义映射的另一个选项.

Here is another option where you define custom mapping just for the Children property.

Mapper.Initialize(cfg =>
{
   cfg.CreateMap<ParentChildDTO, Parent>()
      .ForMember(d => d.Children, 
         opt => opt.MapFrom(src => new List<Child>() { new Child() { ChildId = src.ChildId, ChildName = src.ChildName } }));
});

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